Here is the NIST standard referenced in the documentation commantary on M584
https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=823374#G5.1010695
So angular feedrate is F, if only the rotational axis are moving. Not sure how to specify angular rate if a linear axis is moving. Will the move be completed in the time it takes to travel the linear distance from start to finish of the G1 command and the rotational speed set to achieve this? I assume if a rotational axis becomes a limiting factor then the whole move will be slowed rather than having a XYZUVW motion pause at the end of the G1 vector while the ABCD axis catch up?
Edit:
In other words ABCD behaves very similarly to E, including how solo moves alter the interpretation of F? So there are three stores of F values; linear feedrate, solo extrusion feedrate, and solo rotational feedrate?
Presume this line from the G0/1 doc:
"Not all parameters need to be used, but at least one of XYZEF must be used"
...should read as follows?
"Not all parameters need to be used, but at least one of XYZUVWABCDEF must be used"